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Title: On the seasonal variability of the Canary Current and the Atlantic Meridional Overturning Circulation
Authors: Vélez Belchí,Pedro 
Perez Hernandez, Maria Dolores 
Casanova-Masjoan, Maria 
Cana, Luis 
Hernandez-Guerra, Alonso 
UNESCO Clasification: 2510 Oceanografía
Keywords: Phytoplankton Pigment Patterns
Eastern Boundary Current
Poleward Heat-Transport
Subtropical Gyre
Pacific Oceans
Islands Area
Issue Date: 2017
Journal: Journal of geophysical research. Oceans 
Abstract: The Atlantic Meridional Overturning Circulation (AMOC) is continually monitored along 26 degrees N by the RAPID-MOCHA array. Measurements from this array show a 6.7 Sv seasonal cycle for the AMOC, with a 5.9 Sv contribution from the upper mid-ocean. Recent studies argue that the dynamics of the eastern Atlantic is the main driver for this seasonal cycle; specifically, Rossby waves excited south of the Canary Islands. Using inverse modeling, hydrographic, mooring, and altimetry data, we describe the seasonal cycle of the ocean mass transport around the Canary Islands and at the eastern boundary, under the influence of the African slope, where eastern component of the RAPID-MOCHA array is situated. We find a seasonal cycle of -4.1 +/- 0.5 Sv for the oceanic region of the Canary Current, and +3.7 +/- 0.4 Sv at the eastern boundary. This seasonal cycle along the eastern boundary is in agreement with the seasonal cycle of the AMOC that requires the lowest contribution to the transport in the upper mid-ocean to occur in fall. However, we demonstrate that the linear Rossby wave model used previously to explain the seasonal cycle of the AMOC is not robust, since it is extremely sensitive to the choice of the zonal range of the wind stress curl and produces the same results with a Rossby wave speed of zero. We demonstrate that the seasonal cycle of the eastern boundary is due to the recirculation of the Canary Current and to the seasonal cycle of the poleward flow that characterizes the eastern boundaries of the oceans.
ISSN: 2169-9275
DOI: 10.1002/2017JC012774
Source: Journal Of Geophysical Research-Oceans[ISSN 2169-9275],v. 122 (6), p. 4518-4538
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